A great insult to fling at people. Or just something to say when there is nothing else to fill the void. Also, the source of many dirty jokes.
A) "Yer mom is so -insert insult here-
B) Person 1: "Hi, how are you?"
Person 2: "Yer mom!"
C) Person 1: "Hey, you poked a hole in my balloon! I hate you!"
Person 2: "I poked a hole in your mom last night."
the best insult in my mind. it also works if you get asked a question and dont want to answer it or just feel like wierding someone out. it also works if you get insulted. also one of the best starts to jokes. (a.k.a. yer mom jokes)
Jorgé the muffin: you suck
Bob: yer mom sucks
Jorgé the muffin: whats up?
Bob: yer mom. what else.
Jorgé the muffin: hey you wanna go out?
Bob: yer mom wants to go out.
Bob: Yer mom's so stupid that she got run over by a parked car.
Bob: Yer mom's so fat, she needs a watch on both arms because she covers two time zones.
Bob: Yer mom's so slow it takes her two hours to watch the tv show 60 Minutes.
Widespread use of this phrase was brought back to life after the movie Napolean Dynamite hit theatres. This is generally used as an insult, though it can be thrown into a conversation at any point in time.
Andrews - "Yer mom's so fat... that when we tried to graph her on our calculator... there was a stack overflow error."
something to say to people to get them mad at you because people here it so much. so if you wanna nice old punch in the face you just say it till you cant talk no more
person #1: hi
person #2: YER MOM
person #1: SHUT UP SPED
person:#2: BITE ME!!! AHHHHHHHHHHHH